#include <stdio.h>
#include <string.h>

int main ()
{
   char src[50], dest[50];

   strcpy(src,  "This is chinese");
   strcpy(dest, "This is US");

   strcat(dest, " ");
   strncat(dest, src, 10);

   printf("最终的目标字符串： |%s|", dest);
   
   return(0);
}